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Title: Aerosol properties computed from aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure

Abstract

For a vertical profile with three distinct layers (marine boundary, pollution and dust layers), observed during the ACE-Asia campaign, we carried out a comparison between the modeled lidar ratio vertical profile and that obtained from co-located airborne NASA AATS-14 sunphotometer and shipborne Micro-Pulse Lidar (MPL) measurements. The vertically resolved lidar ratio was calculated from two size distribution vertical profiles – one obtained by inversion of sunphotometer-derived extinction spectra, and one measured in-situ – combined with the same refractive index model based on aerosol chemical composition. The aerosol model implies single scattering albedos of 0.78 – 0.81 and 0.93 – 0.96 at 0.523 μm (the wavelength of the lidar measurements), in the pollution and dust layers, respectively. The lidar ratios calculated from the two size distribution profiles agree closely in the dust layer; they are however, significantly lower than the lidar ratios derived from combined lidar and sunphotometer measurements. Uncertainties in aerosol size distributions and refractive index only partly explain these differences, suggesting that particle nonsphericity in this layer is an additional explanation. In the pollution layer, the two size distribution profiles yield lidar ratios that agree within the estimated uncertainties. The retrieved size distributions result in a lidar ratio whichmore » is in closer agreement with that derived from lidar/sunphotometer measurements in this layer, with still large differences at certain altitudes (the largest relative difference was 46%). We explain these differences by non-uniqueness of the result of the size distribution retrieval, by a lack of information on the mixing state of particles, and the vertical variability of the particle refractive index.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
902039
Report Number(s):
PNNL-SA-54428
Journal ID: ISSN 0278-6826; ASTYDQ; TRN: US200716%%600
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Aerosol Science and Technology, 41(3):231-243; Journal Volume: 41; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AEROSOLS; CHEMICAL COMPOSITION; CLOSURES; DISTRIBUTION; DUSTS; NASA; OPTICAL RADAR; POLLUTION; REFRACTIVE INDEX; SCATTERING; SPECTRA; WAVELENGTHS

Citation Formats

Kuzmanoski, Maja, Box, M. A., Schmid, Beat, Box, G. P., Wang, Jian, Russel, P. R., Bates, D., Jonsson, Haf, Welton, E. J., and Seinfeld, J. H. Aerosol properties computed from aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure. United States: N. p., 2007. Web. doi:10.1080/02786820601146977.
Kuzmanoski, Maja, Box, M. A., Schmid, Beat, Box, G. P., Wang, Jian, Russel, P. R., Bates, D., Jonsson, Haf, Welton, E. J., & Seinfeld, J. H. Aerosol properties computed from aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure. United States. doi:10.1080/02786820601146977.
Kuzmanoski, Maja, Box, M. A., Schmid, Beat, Box, G. P., Wang, Jian, Russel, P. R., Bates, D., Jonsson, Haf, Welton, E. J., and Seinfeld, J. H. Tue . "Aerosol properties computed from aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure". United States. doi:10.1080/02786820601146977.
@article{osti_902039,
title = {Aerosol properties computed from aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure},
author = {Kuzmanoski, Maja and Box, M. A. and Schmid, Beat and Box, G. P. and Wang, Jian and Russel, P. R. and Bates, D. and Jonsson, Haf and Welton, E. J. and Seinfeld, J. H.},
abstractNote = {For a vertical profile with three distinct layers (marine boundary, pollution and dust layers), observed during the ACE-Asia campaign, we carried out a comparison between the modeled lidar ratio vertical profile and that obtained from co-located airborne NASA AATS-14 sunphotometer and shipborne Micro-Pulse Lidar (MPL) measurements. The vertically resolved lidar ratio was calculated from two size distribution vertical profiles – one obtained by inversion of sunphotometer-derived extinction spectra, and one measured in-situ – combined with the same refractive index model based on aerosol chemical composition. The aerosol model implies single scattering albedos of 0.78 – 0.81 and 0.93 – 0.96 at 0.523 μm (the wavelength of the lidar measurements), in the pollution and dust layers, respectively. The lidar ratios calculated from the two size distribution profiles agree closely in the dust layer; they are however, significantly lower than the lidar ratios derived from combined lidar and sunphotometer measurements. Uncertainties in aerosol size distributions and refractive index only partly explain these differences, suggesting that particle nonsphericity in this layer is an additional explanation. In the pollution layer, the two size distribution profiles yield lidar ratios that agree within the estimated uncertainties. The retrieved size distributions result in a lidar ratio which is in closer agreement with that derived from lidar/sunphotometer measurements in this layer, with still large differences at certain altitudes (the largest relative difference was 46%). We explain these differences by non-uniqueness of the result of the size distribution retrieval, by a lack of information on the mixing state of particles, and the vertical variability of the particle refractive index.},
doi = {10.1080/02786820601146977},
journal = {Aerosol Science and Technology, 41(3):231-243},
number = 3,
volume = 41,
place = {United States},
year = {Tue Apr 03 00:00:00 EDT 2007},
month = {Tue Apr 03 00:00:00 EDT 2007}
}